4f4c4942-4343-5764-6473-313134393434 English NRW_DS109834 Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en 2026-10-20T14:46:41.766Z NRW 1.0 wel utf8 British National Grid (EPSG::27700) Intertidal Monitoring of Sediment Transects in Carmarthen Bay and Estuaries Special Area of Conservation (SAC) 2009 Intertidal Monitoring of Sediment Transects in Carmarthen Bay and Estuaries Special Area of Conservation (SAC) 2009 Gwaith Monitro Rhynglwnaol ar Gymunedau Gwaddodion yn ACA Bae Caerfyrddin ac Aberoedd 2009 2009 CCW / ASML Carmarthen Bay and Estuaries SAC transect survey (MRCCW16300000024) 2012-06-30 NRW_DS114944 http://naturalresources.wales/ Intertidal sediment monitoring undertaken within the Carmarthen Bay and Estuaries SAC, focusing on the Annex I habitat feature "Mudflats and sandflats not covered by seawater at low tide". A network of sediment monitoring locations was established across the SAC to represent a range of habitats and environmental conditions. The dataset supports long-term condition monitoring through repeated survey and sampling of fixed monitoring stations. Intertidal sediment monitoring undertaken within the Carmarthen Bay and Estuaries SAC, focusing on the Annex I habitat feature "Mudflats and sandflats not covered by seawater at low tide". A network of sediment monitoring locations was established across the SAC to represent a range of habitats and environmental conditions. The dataset supports long-term condition monitoring through repeated survey and sampling of fixed monitoring stations. Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Countryside Council for Wales (CCW). Marine and Freshwater Ecosystems Group Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@ccw.gov.uk http://www.ccw.gov.uk Aquatic Survey and Monitoring Ltd (ASML) Whitfield Brow, Bollihope, Frosterley, Weardale, Co. Durham, DL13 2SZ, England tom@aquatic-environments.co.uk http://www.marineseen.com/aquatic_survey_and_monitoring.htm Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Habitats and biotopes GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Marine Recorder Mudflats and sandflats Carmarthen Bay and Estuaries SAC NRW Thesaurus 2026-10-19 geonetwork.thesaurus.local.theme.converted_nrw-keywords Habitat characterisation SeaDataNet Parameter Discovery Vocabulary 2024-06-19 geonetwork.thesaurus.external.theme.rdf+xml There are no access restrictions to this data. NRW may release, publish or disseminate it freely. no limitations © CNC/NRW Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and NRW's copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose. Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. Open Government Licence English biota SeaVoX Vertical Co-ordinate Coverages 2021-01-06 benthic boundary layer ABERTAWE - SWANSEA SIR GAERFYRDDIN - CARMARTHENSHIRE -4.42229782 -4.13213629 51.62046149 51.7754583 2009-09-20 2009-09-22 Intertidal SAC monitoring Carmarthen Bay SAC September 2009 Database Marine Recorder Online - Version 2.09.02 Marine Recorder Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 This dataset has not been assessed for conformance to the referenced INSPIRE regulation. false In Carmarthen Bay and Estuaries SAC, the Annex I intertidal habitat features include "Mudflats and sandflats not covered by seawater at low tide". A series of 23 sediment monitoring locations, distributed throughout the SAC to represent different areas and habitats, were established between 2005 and 2008. Most locations were initially defined as transects extending from the upper to lower shore, although many have subsequently been redefined as groups of monitoring stations. Between one and six fixed sampling stations were established within each location, with some stations requiring repositioning due to channel movements. Monitoring has been undertaken using a combination of in-situ recording and sediment core sampling, with laboratory analysis of infaunal composition and sediment granulometry. Some locations, including Crofty and Llansteffan, are surveyed annually, whilst others are surveyed at intervals of two years or more. Two survey methods were employed: 1. In-situ survey of conspicuous epibiota and their abundance visible on the sediment surface within a 5 m radius of GPS-located station coordinates, together with in-situ characterisation of sediment habitat. Photographs of the habitat and representative core samples were taken at each station. 2. Five 0.01 m² core samples were collected at each station, sieved and preserved in formalin for infaunal analysis. A sediment sample was also collected for granulometry analysis. Data were collated and used to assign biotopes to each station. In Carmarthen Bay and Estuaries SAC, the Annex I intertidal habitat features include "Mudflats and sandflats not covered by seawater at low tide". A series of 23 sediment monitoring locations, distributed throughout the SAC to represent different areas and habitats, were established between 2005 and 2008. Most locations were initially defined as transects extending from the upper to lower shore, although many have subsequently been redefined as groups of monitoring stations. Between one and six fixed sampling stations were established within each location, with some stations requiring repositioning due to channel movements. Monitoring has been undertaken using a combination of in-situ recording and sediment core sampling, with laboratory analysis of infaunal composition and sediment granulometry. Some locations, including Crofty and Llansteffan, are surveyed annually, whilst others are surveyed at intervals of two years or more. Two survey methods were employed: 1. In-situ survey of conspicuous epibiota and their abundance visible on the sediment surface within a 5 m radius of GPS-located station coordinates, together with in-situ characterisation of sediment habitat. Photographs of the habitat and representative core samples were taken at each station. 2. Five 0.01 m² core samples were collected at each station, sieved and preserved in formalin for infaunal analysis. A sediment sample was also collected for granulometry analysis. Data were collated and used to assign biotopes to each station.